#coding:utf-8
from  bs4 import BeautifulSoup
import re
import urllib.parse

class HtmlPaeser():

    def _get_new_urls(self,page_url,soup):
        new_urls=set()
        #view/123.htm
        links = soup.find_all('a',href=re.compile(r"/view/\d+\.htm"))
        for link in links:
            new_url = link['href']
            new_full_url = urllib.parse.urljoin(page_url,new_url)
            new_urls.add(new_full_url)
        return new_urls

    def _get_new_data(self,page_url,soup):
        res_data={}

        #url
        res_data['url'] = page_url

        #<dd class="lemmaWgt-lemmaTitle-title"><h1>Python</h1>
        title_node= soup.find('dd',class_="lemmaWgt-lemmaTitle-title").find("h1")

        res_data['title'] = title_node.get_text()

        #<div class="lemma-summary" label-module="lemmaSummary">
        summary_node=soup.find('div',class_="lemma-summary")
        res_data['summary'] = summary_node.get_text()

        return res_data


    def parse(self,page_url,html_cont):
        if page_url is None or html_cont is None:
            return

        soup = BeautifulSoup(html_cont,'html.parser',from_encoding='utf-8')


        new_urls = self._get_new_urls(page_url,soup)
        new_data = self._get_new_data(page_url,soup)
        return new_urls,new_data


